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JS實現(xiàn)電商放大鏡效果

更新時間：2017年08月24日 08:57:51 作者：前端站

這篇文章主要為大家詳細(xì)介紹了JS實現(xiàn)電商放大鏡效果，具有一定的參考價值，感興趣的小伙伴們可以參考一下

前端JS電商放大鏡效果，供大家參考，具體內(nèi)容如下

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>26-電商放大鏡</title>
  <style type="text/css">
    
  *{
    padding: 0;
    margin: 0;
  }
  #left{
   padding: 0;
  margin: 0;
    width: 400px;
    height: 400px;
    border: 2px solid blue;
    background: url(http://chuantu.biz/t6/17/1503469475x2063891122.jpg) no-repeat;
    float: left;
    cursor: crosshair;
    position: relative;
  box-sizing: border-box;
  }
  #box{
    width: 200px;
    height: 200px;
    background: white;
    opacity: 0.6;
    position: absolute;
    top: 0;
    left: 0;
    display: none;
  box-sizing: border-box;
  }
  #cover{
    width: 400px;
    height: 400px;
    background: red;
    position: absolute;
    left: 0;
    top: 0;
    opacity: 0;
  box-sizing: border-box;
  }
  #right{
    width: 400px;
    height: 400px;
    border: 2px solid black;
    overflow: hidden;
    position: relative;
    display: none;
  box-sizing: border-box;
  }
  #rpic{
    position: absolute;
  }
  </style>

  <script type="text/javascript">
    
  window.onload = function(){
    var left = document.getElementById("left");
    var right = document.getElementById("right");
    var rpic = document.getElementById("rpic");
    var box = document.getElementById("box");
    var cover = document.getElementById("cover");

    // 給左側(cè)加鼠標(biāo)移動事件
    cover.onmousemove = function(){

      //獲得事件對象
      var ev = window.event;
      var mouse_left = ev.offsetX || ev.layerX;
      var mouse_top = ev.offsetY || ev.layerY;
      // document.title = mouse_left + '|' + mouse_top;

      //計算色塊的位置
      var box_left = mouse_left - 100;
      var box_top = mouse_top - 100;

      // 判斷是否超出
      if (box_left < 0) {
        box_left = 0;
      }
      if (box_left > 200) {
        box_left = 200;
      }
      if (box_top < 0) {
        box_top = 0;
      }
      if (box_top > 200) {
        box_top = 200;
      }

      // 讓色塊移動
      box.style.left = box_left + 'px';
      box.style.top = box_top + 'px';

      //計算右側(cè)圖片位置
      var rpic_left = box_left*-2;
      var rpic_top = box_top*-2;

      // 讓右側(cè)移動
      rpic.style.left = rpic_left + 'px';
      rpic.style.top = rpic_top + 'px';

    }

      //給左側(cè)加鼠標(biāo)移入事件
      cover.onmouseover = function(){
        // 讓左側(cè)色塊和右側(cè)隱藏
        box.style.display = 'block';
        right.style.display = 'block';
      }

      // 給左側(cè)加鼠標(biāo)移出事件
      cover.onmouseout = function(){
        // 讓左側(cè)色塊和右側(cè)隱藏
        box.style.display = 'none';
        right.style.display = 'none';
      }
  }

  </script>
</head>
<body>
  <div id="left">
    <div id="box"></div>
    <div id="cover"></div>
  </div>
  <div id="right">
    <img src="http://chuantu.biz/t6/17/1503469419x2063891122.jpg" id="rpic">
  </div>
</body>
</html>

以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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